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Morrison Quarry AM-07 Geotechnical Stability Exhibit <br /> DRMS Permit M-1973-021 <br /> Aggregate Industries WCR Inc. <br /> Mohr-Coulomb Equivalents for Hoek-Brown Criterion <br /> The figures and tables below show Mohr-Coulomb strength parameters (friction angle and cohesion)for <br /> the granitic/biotitic gneiss and the sillimanitic gneiss for local and global failures. The friction angle and <br /> cohesion are provided for normal stresses that correspond with a 70 ft, 250 ft, and 1,400 ft highwall <br /> heights, and output values are from RocLab (V1.0). <br /> Granitic Gneiss and Biotite <br /> B Sillimanitic Gneiss <br /> Bench Height Gneiss <br /> Friction Angle 'Apparent Friction Angle Apparent <br /> Cohesion (ksi) Cohesion (ksi) <br /> 0-70ft 63.54 0.064 57.37 0.040 <br /> 70-250 ft 56.29 _ 0.130 48.99 0.087 <br /> 250-1,400 ft 44.31 0.383 36.22 0.259 <br /> GEI Consultants, Inc. 8 of 25 Appendix C.1 <br /> November 2020 <br />